24 files changed, 536 insertions, 111 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 5669f71dfdd5..353d3fe8ba33 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -43,7 +43,7 @@ obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
 obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
 obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
-obj-$(CONFIG_USE_GENERIC_SMP_HELPERS) += smp.o
+obj-$(CONFIG_SMP) += smp.o
 ifneq ($(CONFIG_SMP),y)
 obj-y += up.o
 endif
diff --git a/kernel/audit.c b/kernel/audit.c
index 77770a034d59..e4956244ae50 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -400,7 +400,7 @@ static void kauditd_send_skb(struct sk_buff *skb)
 	if (err < 0) {
 		BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */
 		printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
-		audit_log_lost("auditd dissapeared\n");
+		audit_log_lost("auditd disappeared\n");
 		audit_pid = 0;
 		/* we might get lucky and get this in the next auditd */
 		audit_hold_skb(skb);
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index a6e729766821..bd3e8e29caa3 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2914,7 +2914,7 @@ static void __init kdb_cmd_init(void)
 	}
 }
 
-/* Intialize kdb_printf, breakpoint tables and kdb state */
+/* Initialize kdb_printf, breakpoint tables and kdb state */
 void __init kdb_init(int lvl)
 {
 	static int kdb_init_lvl = KDB_NOT_INITIALIZED;
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 45da2b6920ab..0c8d7c048615 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1745,7 +1745,7 @@ schedule_hrtimeout_range_clock(ktime_t *expires, unsigned long delta,
 	}
 
 	/*
-	 * A NULL parameter means "inifinte"
+	 * A NULL parameter means "infinite"
 	 */
 	if (!expires) {
 		schedule();
diff --git a/kernel/kexec.c b/kernel/kexec.c
index b55045bc7563..ec19b92c7ebd 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -163,7 +163,7 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
 	 * just verifies it is an address we can use.
 	 *
 	 * Since the kernel does everything in page size chunks ensure
-	 * the destination addreses are page aligned.  Too many
+	 * the destination addresses are page aligned.  Too many
 	 * special cases crop of when we don't do this.  The most
 	 * insidious is getting overlapping destination addresses
 	 * simply because addresses are changed to page size
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index 17110a4a4fc2..ee74b35e528d 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -241,24 +241,19 @@ static int lstats_show(struct seq_file *m, void *v)
 	seq_puts(m, "Latency Top version : v0.1\n");
 
 	for (i = 0; i < MAXLR; i++) {
-		if (latency_record[i].backtrace[0]) {
+		struct latency_record *lr = &latency_record[i];
+
+		if (lr->backtrace[0]) {
 			int q;
-			seq_printf(m, "%i %lu %lu ",
-				latency_record[i].count,
-				latency_record[i].time,
-				latency_record[i].max);
+			seq_printf(m, "%i %lu %lu",
+				   lr->count, lr->time, lr->max);
 			for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
-				char sym[KSYM_SYMBOL_LEN];
-				char *c;
-				if (!latency_record[i].backtrace[q])
+				unsigned long bt = lr->backtrace[q];
+				if (!bt)
 					break;
-				if (latency_record[i].backtrace[q] == ULONG_MAX)
+				if (bt == ULONG_MAX)
 					break;
-				sprint_symbol(sym, latency_record[i].backtrace[q]);
-				c = strchr(sym, '+');
-				if (c)
-					*c = 0;
-				seq_printf(m, "%s ", sym);
+				seq_printf(m, " %ps", (void *)bt);
 			}
 			seq_printf(m, "\n");
 		}
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index b782b7a79f00..05ebe841270b 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4664,7 +4664,7 @@ int perf_swevent_get_recursion_context(void)
 }
 EXPORT_SYMBOL_GPL(perf_swevent_get_recursion_context);
 
-void inline perf_swevent_put_recursion_context(int rctx)
+inline void perf_swevent_put_recursion_context(int rctx)
 {
 	struct swevent_htable *swhash = &__get_cpu_var(swevent_htable);
 
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 870f72bc72ae..1832bd264219 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -51,14 +51,14 @@ enum {
 
 static int hibernation_mode = HIBERNATION_SHUTDOWN;
 
-static struct platform_hibernation_ops *hibernation_ops;
+static const struct platform_hibernation_ops *hibernation_ops;
 
 /**
  * hibernation_set_ops - set the global hibernate operations
  * @ops: the hibernation operations to use in subsequent hibernation transitions
  */
 
-void hibernation_set_ops(struct platform_hibernation_ops *ops)
+void hibernation_set_ops(const struct platform_hibernation_ops *ops)
 {
 	if (ops && !(ops->begin && ops->end &&  ops->pre_snapshot
 	    && ops->prepare && ops->finish && ops->enter && ops->pre_restore
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 8850df68794d..de6f86bfa303 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -31,13 +31,13 @@ const char *const pm_states[PM_SUSPEND_MAX] = {
 	[PM_SUSPEND_MEM]	= "mem",
 };
 
-static struct platform_suspend_ops *suspend_ops;
+static const struct platform_suspend_ops *suspend_ops;
 
 /**
  *	suspend_set_ops - Set the global suspend method table.
  *	@ops:	Pointer to ops structure.
  */
-void suspend_set_ops(struct platform_suspend_ops *ops)
+void suspend_set_ops(const struct platform_suspend_ops *ops)
 {
 	mutex_lock(&pm_mutex);
 	suspend_ops = ops;
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 8c7e4832b9be..69425889bd40 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -888,7 +888,7 @@ out_finish:
 /**
  *	swsusp_read - read the hibernation image.
  *	@flags_p: flags passed by the "frozen" kernel in the image header should
- *		  be written into this memeory location
+ *		  be written into this memory location
  */
 
 int swsusp_read(unsigned int *flags_p)
diff --git a/kernel/printk.c b/kernel/printk.c
index f64b8997fc76..53d9a9ec88e6 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -39,6 +39,7 @@
 #include <linux/syslog.h>
 #include <linux/cpu.h>
 #include <linux/notifier.h>
+#include <linux/rculist.h>
 
 #include <asm/uaccess.h>
 
@@ -1502,7 +1503,7 @@ int kmsg_dump_register(struct kmsg_dumper *dumper)
 	/* Don't allow registering multiple times */
 	if (!dumper->registered) {
 		dumper->registered = 1;
-		list_add_tail(&dumper->list, &dump_list);
+		list_add_tail_rcu(&dumper->list, &dump_list);
 		err = 0;
 	}
 	spin_unlock_irqrestore(&dump_list_lock, flags);
@@ -1526,29 +1527,16 @@ int kmsg_dump_unregister(struct kmsg_dumper *dumper)
 	spin_lock_irqsave(&dump_list_lock, flags);
 	if (dumper->registered) {
 		dumper->registered = 0;
-		list_del(&dumper->list);
+		list_del_rcu(&dumper->list);
 		err = 0;
 	}
 	spin_unlock_irqrestore(&dump_list_lock, flags);
+	synchronize_rcu();
 
 	return err;
 }
 EXPORT_SYMBOL_GPL(kmsg_dump_unregister);
 
-static const char * const kmsg_reasons[] = {
-	[KMSG_DUMP_OOPS]	= "oops",
-	[KMSG_DUMP_PANIC]	= "panic",
-	[KMSG_DUMP_KEXEC]	= "kexec",
-};
-
-static const char *kmsg_to_str(enum kmsg_dump_reason reason)
-{
-	if (reason >= ARRAY_SIZE(kmsg_reasons) || reason < 0)
-		return "unknown";
-
-	return kmsg_reasons[reason];
-}
-
 /**
  * kmsg_dump - dump kernel log to kernel message dumpers.
  * @reason: the reason (oops, panic etc) for dumping
@@ -1587,13 +1575,9 @@ void kmsg_dump(enum kmsg_dump_reason reason)
 		l2 = chars;
 	}
 
-	if (!spin_trylock_irqsave(&dump_list_lock, flags)) {
-		printk(KERN_ERR "dump_kmsg: dump list lock is held during %s, skipping dump\n",
-				kmsg_to_str(reason));
-		return;
-	}
-	list_for_each_entry(dumper, &dump_list, list)
+	rcu_read_lock();
+	list_for_each_entry_rcu(dumper, &dump_list, list)
 		dumper->dump(dumper, reason, s1, l1, s2, l2);
-	spin_unlock_irqrestore(&dump_list_lock, flags);
+	rcu_read_unlock();
 }
 #endif
diff --git a/kernel/sched.c b/kernel/sched.c
index a0eb0941fa84..ea3e5eff3878 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2505,7 +2505,7 @@ out:
  * try_to_wake_up_local - try to wake up a local task with rq lock held
  * @p: the thread to be awakened
  *
- * Put @p on the run-queue if it's not alredy there.  The caller must
+ * Put @p on the run-queue if it's not already there.  The caller must
  * ensure that this_rq() is locked, @p is bound to this_rq() and not
  * the current task.  this_rq() stays locked over invocation.
  */
diff --git a/kernel/smp.c b/kernel/smp.c
index 12ed8b013e2d..4ec30e069987 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -13,6 +13,7 @@
 #include <linux/smp.h>
 #include <linux/cpu.h>
 
+#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
 static struct {
 	struct list_head	queue;
 	raw_spinlock_t		lock;
@@ -529,3 +530,21 @@ void ipi_call_unlock_irq(void)
 {
 	raw_spin_unlock_irq(&call_function.lock);
 }
+#endif /* USE_GENERIC_SMP_HELPERS */
+
+/*
+ * Call a function on all processors
+ */
+int on_each_cpu(void (*func) (void *info), void *info, int wait)
+{
+	int ret = 0;
+
+	preempt_disable();
+	ret = smp_call_function(func, info, wait);
+	local_irq_disable();
+	func(info);
+	local_irq_enable();
+	preempt_enable();
+	return ret;
+}
+EXPORT_SYMBOL(on_each_cpu);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 0823778f87fc..68eb5efec388 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -885,25 +885,6 @@ static __init int spawn_ksoftirqd(void)
 }
 early_initcall(spawn_ksoftirqd);
 
-#ifdef CONFIG_SMP
-/*
- * Call a function on all processors
- */
-int on_each_cpu(void (*func) (void *info), void *info, int wait)
-{
-	int ret = 0;
-
-	preempt_disable();
-	ret = smp_call_function(func, info, wait);
-	local_irq_disable();
-	func(info);
-	local_irq_enable();
-	preempt_enable();
-	return ret;
-}
-EXPORT_SYMBOL(on_each_cpu);
-#endif
-
 /*
  * [ These __weak aliases are kept in a separate compilation unit, so that
  *   GCC does not inline them incorrectly. ]
diff --git a/kernel/sys.c b/kernel/sys.c
index 2745dcdb6c6c..31b71a276b40 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -43,6 +43,8 @@
 #include <linux/kprobes.h>
 #include <linux/user_namespace.h>
 
+#include <linux/kmsg_dump.h>
+
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/unistd.h>
@@ -285,6 +287,7 @@ out_unlock:
  */
 void emergency_restart(void)
 {
+	kmsg_dump(KMSG_DUMP_EMERG);
 	machine_emergency_restart();
 }
 EXPORT_SYMBOL_GPL(emergency_restart);
@@ -312,6 +315,7 @@ void kernel_restart(char *cmd)
 		printk(KERN_EMERG "Restarting system.\n");
 	else
 		printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
+	kmsg_dump(KMSG_DUMP_RESTART);
 	machine_restart(cmd);
 }
 EXPORT_SYMBOL_GPL(kernel_restart);
@@ -333,6 +337,7 @@ void kernel_halt(void)
 	kernel_shutdown_prepare(SYSTEM_HALT);
 	sysdev_shutdown();
 	printk(KERN_EMERG "System halted.\n");
+	kmsg_dump(KMSG_DUMP_HALT);
 	machine_halt();
 }
 
@@ -351,6 +356,7 @@ void kernel_power_off(void)
 	disable_nonboot_cpus();
 	sysdev_shutdown();
 	printk(KERN_EMERG "Power down.\n");
+	kmsg_dump(KMSG_DUMP_POWEROFF);
 	machine_power_off();
 }
 EXPORT_SYMBOL_GPL(kernel_power_off);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ae5cbb1e3ced..bc86bb32e126 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <linux/sysctl.h>
 #include <linux/signal.h>
+#include <linux/printk.h>
 #include <linux/proc_fs.h>
 #include <linux/security.h>
 #include <linux/ctype.h>
@@ -245,10 +246,6 @@ static struct ctl_table root_table[] = {
 		.mode		= 0555,
 		.child		= dev_table,
 	},
-/*
- * NOTE: do not add new entries to this table unless you have read
- * Documentation/sysctl/ctl_unnumbered.txt
- */
 	{ }
 };
 
@@ -710,6 +707,15 @@ static struct ctl_table kern_table[] = {
 		.extra1		= &zero,
 		.extra2		= &one,
 	},
+	{
+		.procname	= "kptr_restrict",
+		.data		= &kptr_restrict,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &two,
+	},
 #endif
 	{
 		.procname	= "ngroups_max",
@@ -962,10 +968,6 @@ static struct ctl_table kern_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
-/*
- * NOTE: do not add new entries to this table unless you have read
- * Documentation/sysctl/ctl_unnumbered.txt
- */
 	{ }
 };
 
@@ -1326,11 +1328,6 @@ static struct ctl_table vm_table[] = {
 		.extra2		= &one,
 	},
 #endif
-
-/*
- * NOTE: do not add new entries to this table unless you have read
- * Documentation/sysctl/ctl_unnumbered.txt
- */
 	{ }
 };
 
@@ -1486,10 +1483,6 @@ static struct ctl_table fs_table[] = {
 		.proc_handler	= &pipe_proc_fn,
 		.extra1		= &pipe_min_size,
 	},
-/*
- * NOTE: do not add new entries to this table unless you have read
- * Documentation/sysctl/ctl_unnumbered.txt
- */
 	{ }
 };
 
@@ -2899,7 +2892,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write,
 	}
 }
 
-#else /* CONFIG_PROC_FS */
+#else /* CONFIG_PROC_SYSCTL */
 
 int proc_dostring(struct ctl_table *table, int write,
 		  void __user *buffer, size_t *lenp, loff_t *ppos)
@@ -2951,7 +2944,7 @@ int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
 }
 
 
-#endif /* CONFIG_PROC_FS */
+#endif /* CONFIG_PROC_SYSCTL */
 
 /*
  * No sense putting this after each symbol definition, twice,
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index 4b2545a136ff..b875bedf7c9a 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -1192,7 +1192,7 @@ static ssize_t bin_dn_node_address(struct file *file,
 
 		buf[result] = '\0';
 
-		/* Convert the decnet addresss to binary */
+		/* Convert the decnet address to binary */
 		result = -EIO;
 		nodep = strchr(buf, '.') + 1;
 		if (!nodep)
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 69691eb4b715..3971c6b9d58d 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -348,7 +348,7 @@ static int parse(struct nlattr *na, struct cpumask *mask)
 	return ret;
 }
 
-#ifdef CONFIG_IA64
+#if defined(CONFIG_64BIT) && !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
 #define TASKSTATS_NEEDS_PADDING 1
 #endif
 
diff --git a/kernel/time.c b/kernel/time.c
index ba9b338d1835..32174359576f 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -238,7 +238,7 @@ EXPORT_SYMBOL(current_fs_time);
  * Avoid unnecessary multiplications/divisions in the
  * two most common HZ cases:
  */
-unsigned int inline jiffies_to_msecs(const unsigned long j)
+inline unsigned int jiffies_to_msecs(const unsigned long j)
 {
 #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
 	return (MSEC_PER_SEC / HZ) * j;
@@ -254,7 +254,7 @@ unsigned int inline jiffies_to_msecs(const unsigned long j)
 }
 EXPORT_SYMBOL(jiffies_to_msecs);
 
-unsigned int inline jiffies_to_usecs(const unsigned long j)
+inline unsigned int jiffies_to_usecs(const unsigned long j)
 {
 #if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
 	return (USEC_PER_SEC / HZ) * j;
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index df140cd3ea47..c50a034de30f 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -679,7 +679,7 @@ EXPORT_SYMBOL_GPL(__clocksource_updatefreq_scale);
 int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
 {
 
-	/* Intialize mult/shift and max_idle_ns */
+	/* Initialize mult/shift and max_idle_ns */
 	__clocksource_updatefreq_scale(cs, scale, freq);
 
 	/* Add clocksource to the clcoksource list */
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index d2321891538f..5c00242fa921 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -14,6 +14,7 @@
 #include <linux/timex.h>
 #include <linux/time.h>
 #include <linux/mm.h>
+#include <linux/module.h>
 
 /*
  * NTP timekeeping variables:
@@ -74,6 +75,162 @@ static long			time_adjust;
 /* constant (boot-param configurable) NTP tick adjustment (upscaled)	*/
 static s64			ntp_tick_adj;
 
+#ifdef CONFIG_NTP_PPS
+
+/*
+ * The following variables are used when a pulse-per-second (PPS) signal
+ * is available. They establish the engineering parameters of the clock
+ * discipline loop when controlled by the PPS signal.
+ */
+#define PPS_VALID	10	/* PPS signal watchdog max (s) */
+#define PPS_POPCORN	4	/* popcorn spike threshold (shift) */
+#define PPS_INTMIN	2	/* min freq interval (s) (shift) */
+#define PPS_INTMAX	8	/* max freq interval (s) (shift) */
+#define PPS_INTCOUNT	4	/* number of consecutive good intervals to
+				   increase pps_shift or consecutive bad
+				   intervals to decrease it */
+#define PPS_MAXWANDER	100000	/* max PPS freq wander (ns/s) */
+
+static int pps_valid;		/* signal watchdog counter */
+static long pps_tf[3];		/* phase median filter */
+static long pps_jitter;		/* current jitter (ns) */
+static struct timespec pps_fbase; /* beginning of the last freq interval */
+static int pps_shift;		/* current interval duration (s) (shift) */
+static int pps_intcnt;		/* interval counter */
+static s64 pps_freq;		/* frequency offset (scaled ns/s) */
+static long pps_stabil;		/* current stability (scaled ns/s) */
+
+/*
+ * PPS signal quality monitors
+ */
+static long pps_calcnt;		/* calibration intervals */
+static long pps_jitcnt;		/* jitter limit exceeded */
+static long pps_stbcnt;		/* stability limit exceeded */
+static long pps_errcnt;		/* calibration errors */
+
+
+/* PPS kernel consumer compensates the whole phase error immediately.
+ * Otherwise, reduce the offset by a fixed factor times the time constant.
+ */
+static inline s64 ntp_offset_chunk(s64 offset)
+{
+	if (time_status & STA_PPSTIME && time_status & STA_PPSSIGNAL)
+		return offset;
+	else
+		return shift_right(offset, SHIFT_PLL + time_constant);
+}
+
+static inline void pps_reset_freq_interval(void)
+{
+	/* the PPS calibration interval may end
+	   surprisingly early */
+	pps_shift = PPS_INTMIN;
+	pps_intcnt = 0;
+}
+
+/**
+ * pps_clear - Clears the PPS state variables
+ *
+ * Must be called while holding a write on the xtime_lock
+ */
+static inline void pps_clear(void)
+{
+	pps_reset_freq_interval();
+	pps_tf[0] = 0;
+	pps_tf[1] = 0;
+	pps_tf[2] = 0;
+	pps_fbase.tv_sec = pps_fbase.tv_nsec = 0;
+	pps_freq = 0;
+}
+
+/* Decrease pps_valid to indicate that another second has passed since
+ * the last PPS signal. When it reaches 0, indicate that PPS signal is
+ * missing.
+ *
+ * Must be called while holding a write on the xtime_lock
+ */
+static inline void pps_dec_valid(void)
+{
+	if (pps_valid > 0)
+		pps_valid--;
+	else {
+		time_status &= ~(STA_PPSSIGNAL | STA_PPSJITTER |
+				 STA_PPSWANDER | STA_PPSERROR);
+		pps_clear();
+	}
+}
+
+static inline void pps_set_freq(s64 freq)
+{
+	pps_freq = freq;
+}
+
+static inline int is_error_status(int status)
+{
+	return (time_status & (STA_UNSYNC|STA_CLOCKERR))
+		/* PPS signal lost when either PPS time or
+		 * PPS frequency synchronization requested
+		 */
+		|| ((time_status & (STA_PPSFREQ|STA_PPSTIME))
+			&& !(time_status & STA_PPSSIGNAL))
+		/* PPS jitter exceeded when
+		 * PPS time synchronization requested */
+		|| ((time_status & (STA_PPSTIME|STA_PPSJITTER))
+			== (STA_PPSTIME|STA_PPSJITTER))
+		/* PPS wander exceeded or calibration error when
+		 * PPS frequency synchronization requested
+		 */
+		|| ((time_status & STA_PPSFREQ)
+			&& (time_status & (STA_PPSWANDER|STA_PPSERROR)));
+}
+
+static inline void pps_fill_timex(struct timex *txc)
+{
+	txc->ppsfreq	   = shift_right((pps_freq >> PPM_SCALE_INV_SHIFT) *
+					 PPM_SCALE_INV, NTP_SCALE_SHIFT);
+	txc->jitter	   = pps_jitter;
+	if (!(time_status & STA_NANO))
+		txc->jitter /= NSEC_PER_USEC;
+	txc->shift	   = pps_shift;
+	txc->stabil	   = pps_stabil;
+	txc->jitcnt	   = pps_jitcnt;
+	txc->calcnt	   = pps_calcnt;
+	txc->errcnt	   = pps_errcnt;
+	txc->stbcnt	   = pps_stbcnt;
+}
+
+#else /* !CONFIG_NTP_PPS */
+
+static inline s64 ntp_offset_chunk(s64 offset)
+{
+	return shift_right(offset, SHIFT_PLL + time_constant);
+}
+
+static inline void pps_reset_freq_interval(void) {}
+static inline void pps_clear(void) {}
+static inline void pps_dec_valid(void) {}
+static inline void pps_set_freq(s64 freq) {}
+
+static inline int is_error_status(int status)
+{
+	return status & (STA_UNSYNC|STA_CLOCKERR);
+}
+
+static inline void pps_fill_timex(struct timex *txc)
+{
+	/* PPS is not implemented, so these are zero */
+	txc->ppsfreq	   = 0;
+	txc->jitter	   = 0;
+	txc->shift	   = 0;
+	txc->stabil	   = 0;
+	txc->jitcnt	   = 0;
+	txc->calcnt	   = 0;
+	txc->errcnt	   = 0;
+	txc->stbcnt	   = 0;
+}
+
+#endif /* CONFIG_NTP_PPS */
+
 /*
  * NTP methods:
  */
@@ -185,6 +342,9 @@ void ntp_clear(void)
 
 	tick_length	= tick_length_base;
 	time_offset	= 0;
+
+	/* Clear PPS state variables */
+	pps_clear();
 }
 
 /*
@@ -250,16 +410,16 @@ void second_overflow(void)
 		time_status |= STA_UNSYNC;
 	}
 
-	/*
-	 * Compute the phase adjustment for the next second. The offset is
-	 * reduced by a fixed factor times the time constant.
-	 */
+	/* Compute the phase adjustment for the next second */
 	tick_length	 = tick_length_base;
 
-	delta		 = shift_right(time_offset, SHIFT_PLL + time_constant);
+	delta		 = ntp_offset_chunk(time_offset);
 	time_offset	-= delta;
 	tick_length	+= delta;
 
+	/* Check PPS signal */
+	pps_dec_valid();
+
 	if (!time_adjust)
 		return;
 
@@ -369,6 +529,8 @@ static inline void process_adj_status(struct timex *txc, struct timespec *ts)
 	if ((time_status & STA_PLL) && !(txc->status & STA_PLL)) {
 		time_state = TIME_OK;
 		time_status = STA_UNSYNC;
+		/* restart PPS frequency calibration */
+		pps_reset_freq_interval();
 	}
 
 	/*
@@ -418,6 +580,8 @@ static inline void process_adjtimex_modes(struct timex *txc, struct timespec *ts
 		time_freq = txc->freq * PPM_SCALE;
 		time_freq = min(time_freq, MAXFREQ_SCALED);
 		time_freq = max(time_freq, -MAXFREQ_SCALED);
+		/* update pps_freq */
+		pps_set_freq(time_freq);
 	}
 
 	if (txc->modes & ADJ_MAXERROR)
@@ -508,7 +672,8 @@ int do_adjtimex(struct timex *txc)
 	}
 
 	result = time_state;	/* mostly `TIME_OK' */
-	if (time_status & (STA_UNSYNC|STA_CLOCKERR))
+	/* check for errors */
+	if (is_error_status(time_status))
 		result = TIME_ERROR;
 
 	txc->freq	   = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
@@ -522,15 +687,8 @@ int do_adjtimex(struct timex *txc)
 	txc->tick	   = tick_usec;
 	txc->tai	   = time_tai;
 
-	/* PPS is not implemented, so these are zero */
-	txc->ppsfreq	   = 0;
-	txc->jitter	   = 0;
-	txc->shift	   = 0;
-	txc->stabil	   = 0;
-	txc->jitcnt	   = 0;
-	txc->calcnt	   = 0;
-	txc->errcnt	   = 0;
-	txc->stbcnt	   = 0;
+	/* fill PPS status fields */
+	pps_fill_timex(txc);
 
 	write_sequnlock_irq(&xtime_lock);
 
@@ -544,6 +702,243 @@ int do_adjtimex(struct timex *txc)
 	return result;
 }
 
+#ifdef	CONFIG_NTP_PPS
+
+/* actually struct pps_normtime is good old struct timespec, but it is
+ * semantically different (and it is the reason why it was invented):
+ * pps_normtime.nsec has a range of ( -NSEC_PER_SEC / 2, NSEC_PER_SEC / 2 ]
+ * while timespec.tv_nsec has a range of [0, NSEC_PER_SEC) */
+struct pps_normtime {
+	__kernel_time_t	sec;	/* seconds */
+	long		nsec;	/* nanoseconds */
+};
+
+/* normalize the timestamp so that nsec is in the
+   ( -NSEC_PER_SEC / 2, NSEC_PER_SEC / 2 ] interval */
+static inline struct pps_normtime pps_normalize_ts(struct timespec ts)
+{
+	struct pps_normtime norm = {
+		.sec = ts.tv_sec,
+		.nsec = ts.tv_nsec
+	};
+
+	if (norm.nsec > (NSEC_PER_SEC >> 1)) {
+		norm.nsec -= NSEC_PER_SEC;
+		norm.sec++;
+	}
+
+	return norm;
+}
+
+/* get current phase correction and jitter */
+static inline long pps_phase_filter_get(long *jitter)
+{
+	*jitter = pps_tf[0] - pps_tf[1];
+	if (*jitter < 0)
+		*jitter = -*jitter;
+
+	/* TODO: test various filters */
+	return pps_tf[0];
+}
+
+/* add the sample to the phase filter */
+static inline void pps_phase_filter_add(long err)
+{
+	pps_tf[2] = pps_tf[1];
+	pps_tf[1] = pps_tf[0];
+	pps_tf[0] = err;
+}
+
+/* decrease frequency calibration interval length.
+ * It is halved after four consecutive unstable intervals.
+ */
+static inline void pps_dec_freq_interval(void)
+{
+	if (--pps_intcnt <= -PPS_INTCOUNT) {
+		pps_intcnt = -PPS_INTCOUNT;
+		if (pps_shift > PPS_INTMIN) {
+			pps_shift--;
+			pps_intcnt = 0;
+		}
+	}
+}
+
+/* increase frequency calibration interval length.
+ * It is doubled after four consecutive stable intervals.
+ */
+static inline void pps_inc_freq_interval(void)
+{
+	if (++pps_intcnt >= PPS_INTCOUNT) {
+		pps_intcnt = PPS_INTCOUNT;
+		if (pps_shift < PPS_INTMAX) {
+			pps_shift++;
+			pps_intcnt = 0;
+		}
+	}
+}
+
+/* update clock frequency based on MONOTONIC_RAW clock PPS signal
+ * timestamps
+ *
+ * At the end of the calibration interval the difference between the
+ * first and last MONOTONIC_RAW clock timestamps divided by the length
+ * of the interval becomes the frequency update. If the interval was
+ * too long, the data are discarded.
+ * Returns the difference between old and new frequency values.
+ */
+static long hardpps_update_freq(struct pps_normtime freq_norm)
+{
+	long delta, delta_mod;
+	s64 ftemp;
+
+	/* check if the frequency interval was too long */
+	if (freq_norm.sec > (2 << pps_shift)) {
+		time_status |= STA_PPSERROR;
+		pps_errcnt++;
+		pps_dec_freq_interval();
+		pr_err("hardpps: PPSERROR: interval too long - %ld s\n",
+				freq_norm.sec);
+		return 0;
+	}
+
+	/* here the raw frequency offset and wander (stability) is
+	 * calculated. If the wander is less than the wander threshold
+	 * the interval is increased; otherwise it is decreased.
+	 */
+	ftemp = div_s64(((s64)(-freq_norm.nsec)) << NTP_SCALE_SHIFT,
+			freq_norm.sec);
+	delta = shift_right(ftemp - pps_freq, NTP_SCALE_SHIFT);
+	pps_freq = ftemp;
+	if (delta > PPS_MAXWANDER || delta < -PPS_MAXWANDER) {
+		pr_warning("hardpps: PPSWANDER: change=%ld\n", delta);
+		time_status |= STA_PPSWANDER;
+		pps_stbcnt++;
+		pps_dec_freq_interval();
+	} else {	/* good sample */
+		pps_inc_freq_interval();
+	}
+
+	/* the stability metric is calculated as the average of recent
+	 * frequency changes, but is used only for performance
+	 * monitoring
+	 */
+	delta_mod = delta;
+	if (delta_mod < 0)
+		delta_mod = -delta_mod;
+	pps_stabil += (div_s64(((s64)delta_mod) <<
+				(NTP_SCALE_SHIFT - SHIFT_USEC),
+				NSEC_PER_USEC) - pps_stabil) >> PPS_INTMIN;
+
+	/* if enabled, the system clock frequency is updated */
+	if ((time_status & STA_PPSFREQ) != 0 &&
+	    (time_status & STA_FREQHOLD) == 0) {
+		time_freq = pps_freq;
+		ntp_update_frequency();
+	}
+
+	return delta;
+}
+
+/* correct REALTIME clock phase error against PPS signal */
+static void hardpps_update_phase(long error)
+{
+	long correction = -error;
+	long jitter;
+
+	/* add the sample to the median filter */
+	pps_phase_filter_add(correction);
+	correction = pps_phase_filter_get(&jitter);
+
+	/* Nominal jitter is due to PPS signal noise. If it exceeds the
+	 * threshold, the sample is discarded; otherwise, if so enabled,
+	 * the time offset is updated.
+	 */
+	if (jitter > (pps_jitter << PPS_POPCORN)) {
+		pr_warning("hardpps: PPSJITTER: jitter=%ld, limit=%ld\n",
+		       jitter, (pps_jitter << PPS_POPCORN));
+		time_status |= STA_PPSJITTER;
+		pps_jitcnt++;
+	} else if (time_status & STA_PPSTIME) {
+		/* correct the time using the phase offset */
+		time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT,
+				NTP_INTERVAL_FREQ);
+		/* cancel running adjtime() */
+		time_adjust = 0;
+	}
+	/* update jitter */
+	pps_jitter += (jitter - pps_jitter) >> PPS_INTMIN;
+}
+
+/*
+ * hardpps() - discipline CPU clock oscillator to external PPS signal
+ *
+ * This routine is called at each PPS signal arrival in order to
+ * discipline the CPU clock oscillator to the PPS signal. It takes two
+ * parameters: REALTIME and MONOTONIC_RAW clock timestamps. The former
+ * is used to correct clock phase error and the latter is used to
+ * correct the frequency.
+ *
+ * This code is based on David Mills's reference nanokernel
+ * implementation. It was mostly rewritten but keeps the same idea.
+ */
+void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
+{
+	struct pps_normtime pts_norm, freq_norm;
+	unsigned long flags;
+
+	pts_norm = pps_normalize_ts(*phase_ts);
+
+	write_seqlock_irqsave(&xtime_lock, flags);
+
+	/* clear the error bits, they will be set again if needed */
+	time_status &= ~(STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR);
+
+	/* indicate signal presence */
+	time_status |= STA_PPSSIGNAL;
+	pps_valid = PPS_VALID;
+
+	/* when called for the first time,
+	 * just start the frequency interval */
+	if (unlikely(pps_fbase.tv_sec == 0)) {
+		pps_fbase = *raw_ts;
+		write_sequnlock_irqrestore(&xtime_lock, flags);
+		return;
+	}
+
+	/* ok, now we have a base for frequency calculation */
+	freq_norm = pps_normalize_ts(timespec_sub(*raw_ts, pps_fbase));
+
+	/* check that the signal is in the range
+	 * [1s - MAXFREQ us, 1s + MAXFREQ us], otherwise reject it */
+	if ((freq_norm.sec == 0) ||
+			(freq_norm.nsec > MAXFREQ * freq_norm.sec) ||
+			(freq_norm.nsec < -MAXFREQ * freq_norm.sec)) {
+		time_status |= STA_PPSJITTER;
+		/* restart the frequency calibration interval */
+		pps_fbase = *raw_ts;
+		write_sequnlock_irqrestore(&xtime_lock, flags);
+		pr_err("hardpps: PPSJITTER: bad pulse\n");
+		return;
+	}
+
+	/* signal is ok */
+
+	/* check if the current frequency interval is finished */
+	if (freq_norm.sec >= (1 << pps_shift)) {
+		pps_calcnt++;
+		/* restart the frequency calibration interval */
+		pps_fbase = *raw_ts;
+		hardpps_update_freq(freq_norm);
+	}
+
+	hardpps_update_phase(pts_norm.nsec);
+
+	write_sequnlock_irqrestore(&xtime_lock, flags);
+}
+EXPORT_SYMBOL(hardpps);
+
+#endif	/* CONFIG_NTP_PPS */
+
 static int __init ntp_tick_adj_setup(char *str)
 {
 	ntp_tick_adj = simple_strtol(str, NULL, 0);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 5bb86da82003..5536aaf3ba36 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -288,6 +288,49 @@ void ktime_get_ts(struct timespec *ts)
 }
 EXPORT_SYMBOL_GPL(ktime_get_ts);
 
+#ifdef CONFIG_NTP_PPS
+
+/**
+ * getnstime_raw_and_real - get day and raw monotonic time in timespec format
+ * @ts_raw:	pointer to the timespec to be set to raw monotonic time
+ * @ts_real:	pointer to the timespec to be set to the time of day
+ *
+ * This function reads both the time of day and raw monotonic time at the
+ * same time atomically and stores the resulting timestamps in timespec
+ * format.
+ */
+void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
+{
+	unsigned long seq;
+	s64 nsecs_raw, nsecs_real;
+
+	WARN_ON_ONCE(timekeeping_suspended);
+
+	do {
+		u32 arch_offset;
+
+		seq = read_seqbegin(&xtime_lock);
+
+		*ts_raw = raw_time;
+		*ts_real = xtime;
+
+		nsecs_raw = timekeeping_get_ns_raw();
+		nsecs_real = timekeeping_get_ns();
+
+		/* If arch requires, add in gettimeoffset() */
+		arch_offset = arch_gettimeoffset();
+		nsecs_raw += arch_offset;
+		nsecs_real += arch_offset;
+
+	} while (read_seqretry(&xtime_lock, seq));
+
+	timespec_add_ns(ts_raw, nsecs_raw);
+	timespec_add_ns(ts_real, nsecs_real);
+}
+EXPORT_SYMBOL(getnstime_raw_and_real);
+
+#endif /* CONFIG_NTP_PPS */
+
 /**
  * do_gettimeofday - Returns the time of day in a timeval
  * @tv:		pointer to the timeval to be set
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index e3dfecaf13e6..6cf223764be8 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -53,7 +53,7 @@
  */
 
 /*
- * Function trace entry - function address and parent function addres:
+ * Function trace entry - function address and parent function address:
  */
 FTRACE_ENTRY(function, ftrace_entry,
 
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 25915832291a..9da289c34f22 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -12,6 +12,8 @@
 #include <linux/highuid.h>
 #include <linux/cred.h>
 
+static struct kmem_cache *user_ns_cachep __read_mostly;
+
 /*
  * Create a new user namespace, deriving the creator from the user in the
  * passed credentials, and replacing that user with the new root user for the
@@ -26,7 +28,7 @@ int create_user_ns(struct cred *new)
 	struct user_struct *root_user;
 	int n;
 
-	ns = kmalloc(sizeof(struct user_namespace), GFP_KERNEL);
+	ns = kmem_cache_alloc(user_ns_cachep, GFP_KERNEL);
 	if (!ns)
 		return -ENOMEM;
 
@@ -38,7 +40,7 @@ int create_user_ns(struct cred *new)
 	/* Alloc new root user.  */
 	root_user = alloc_uid(ns, 0);
 	if (!root_user) {
-		kfree(ns);
+		kmem_cache_free(user_ns_cachep, ns);
 		return -ENOMEM;
 	}
 
@@ -71,7 +73,7 @@ static void free_user_ns_work(struct work_struct *work)
 	struct user_namespace *ns =
 		container_of(work, struct user_namespace, destroyer);
 	free_uid(ns->creator);
-	kfree(ns);
+	kmem_cache_free(user_ns_cachep, ns);
 }
 
 void free_user_ns(struct kref *kref)
@@ -126,3 +128,10 @@ gid_t user_ns_map_gid(struct user_namespace *to, const struct cred *cred, gid_t
 	/* No useful relationship so no mapping */
 	return overflowgid;
 }
+
+static __init int user_namespaces_init(void)
+{
+	user_ns_cachep = KMEM_CACHE(user_namespace, SLAB_PANIC);
+	return 0;
+}
+module_init(user_namespaces_init);